No single database or search engine is complete.
Different cited reference searches in different resources yield different results. For example, see What About Google Scholar.
See below for tips on cited reference searching in Scopus and PubMed.
Scopus records how many times an article has been cited since 1996.
It automatically shows this information for each reference you find.
To search for articles citing your article:
Click HERE for more tips on searching Scopus.
Find out how many times an author's body of publications has been cited (since 1996).
You can also set Alerts for an author, so you will be notified by email whenever something new is published.
PubMed does not have a cited reference searching feature like Web of Science and Scopus do.
The abstract view of a reference will provide links to citing articles,however, IF they are in PubMed Central.
PubMed Central is a repository of publicly available full-text articles that have resulted from NIH funding.